350% is the change from 70 to 315
Calculation steps:
[( 315 - 70 ) ÷ 70] x 100 = 350%
Formula
Percentage change = [(315 - 70) / 70] x 100
Subtract the new number by the original number
315 - 70 = 245
245 ÷ 70 = 3.5
3.5 x 100 = 350%
Example